Configuring a DNS Server to Use a Forwarder
A DNS server can be configured to send an out-of-zone query to another on the chance that the server has already located the record and has it in cache. If the bet fails and the record is not available, the forwarding server walks the tree to find the record on its own.
Before configuring a server to send queries to a forwarder, it is considered good manners to inform the administrator. A forwarding server has the potential for sending many thousands of queries to the forwarder.
The example steps assume that you are configuring an existing DNS server inside a firewall and using a forwarder outside the firewall to resolve Internet addresses. Configure the forwarding option as shown in Procedure 5.17 ...
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